(19)

(11)

EP 3 759 477 A1

(12)

(43) Date of publication: 06.01.2021 Bulletin 2021/01 (21) Application number: 19715184.8 (22) Date of filing: 26.02.2019

(51) International Patent Classification (IPC):  G01N 29/06(2006.01) G01N 29/26(2006.01) G01N 29/24(2006.01) G01N 29/32(2006.01) (86) International application number: PCT/GB2019/050534 (87) International publication number: WO 2019/162707 (29.08.2019 Gazette 2019/35)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 26.02.2018 GB 201803062 25.05.2018 GB 201808654 (71) Applicants: GB Inspection Systems Ltd Cannock, Staffordshire WS7 3GL (GB) Armitt, Timothy James Bamford, Hope Valley Derbyshire S33 0AL (GB)

(72) Inventors: SMITH, Neil Dean Cannock, Staffordshire WS12 4FY (GB) CHOONG, Kam Tong Penkridge, Staffordshire ST19 5QN (GB) ARMITT, Timothy James Hope Valley, Derbyshire S33 0AL (GB) (74) Representative: Hopley, Joanne Selina et al Keltie LLP No.1 London Bridge London SE1 9BA London SE1 9BA (GB)